Worsening violence in the U.S.-led eight-year war with the Taliban has triggered calls for a change of strategy, including the possibility of NATO forces sending more troops to try to stabilise larger areas of Afghanistan.

Britain has about 9,000 troops on the ground and could send about another 500, according to British media reports.

The ministry of defense confirmed a soldier had been killed by an explosion in central Helmand province on Thursday morning, taking the British army death toll to 221 in the conflict.

Newspapers including The Times of London have reported that the 9,000-strong U.K. contingent in Afghanistan, the second- largest after the U.S., will be boosted by about 500. Brown’s spokesman has refused to confirm or deny those reports.

U.S. President Barack Obama is reviewing strategy in Afghanistan and is under pressure from his military commanders to send thousands more troops to help fight the Taliban insurgency. Brown says any increase in U.K. troop numbers is contingent on there being enough resources and equipment to support them and NATO allies doing more to share the burden, Bloomberg reports.

Despite growing public dissatisfaction over Britain's involvement in a conflict that has cost more British troop lives than the invasion and occupation of Iraq, the UK government has also said it would consider sending more soldiers.